Messages in this thread | | | Date | Sun, 28 Mar 2021 14:37:55 +0200 | From | Mateusz Jończyk <> | Subject | Re: Testers wanted: Atom netbooks with x86_64 disabled by BIOS |
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W dniu 28.03.2021 o 00:25, Willy Tarreau pisze: > FWIW I tested on my ASUS 1025C which runs on an Atom N2600 forced to > 32-bit. I had already tried in the past but wanted to give it a try > again in case I'd have missed anything. Sadly it didn't work, I'm > still getting the "requires an x86-64 CPU" message.
Thank you. It looks like your bootloader uses the 16-bit kernel boot protocol. The 16-bit kernel boot code checks for x86_64 presence with a similar message ( inside arch/x86/boot/cpu.c ), which I did not patch out. If you would like to test again, use the same patched kernel, but change in GRUB: "linux16" to "linux" and "initrd16" to "initrd" to use the 32-bit boot protocol. Which distribution and bootloader do you use?
W dniu 28.03.2021 o 03:07, Thomas Gleixner pisze: > There are some of these '32bit only' CPUs out there in the wild which > actually support long mode. Some of them even do not have the long mode > CPUID bit fused out. But whether it works is a different story: > > - If the CPUID bit is on, then the chance is high, but it runs out of > spec (guarantee wise) > > - If it's off is still might work by some definition of work as they > might have fused off more or there are actual defects in some 64bit > only area which are irrelevant when in 32bit mode.
Of course, force enabling x86_64 would require passing a kernel command line parameter with a prominent warning in documentation, just like with "forcepae".
Greetings, Mateusz
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